From 779b84bfa02b3e11f295263971a693bef19c3f9e Mon Sep 17 00:00:00 2001
From: Christof Arnosti <charno@charno.ch>
Date: Sat, 14 Mar 2020 17:31:51 +0100
Subject: usb-serial-for-android: Use wakelock

Android takes some pretty hard measures to save power, including
shutting down the CPU. Since this can interfer with the download from an
usb serial device, we now use a wakelock to keep the CPU running during
download.

Signed-off-by: Christof Arnosti <charno@charno.ch>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
---
 android-mobile/AndroidManifest.xml                               | 1 +
 .../src/org/subsurfacedivelog/mobile/AndroidSerial.java          | 9 +++++++++
 2 files changed, 10 insertions(+)

(limited to 'android-mobile')

diff --git a/android-mobile/AndroidManifest.xml b/android-mobile/AndroidManifest.xml
index bab23a250..578624baf 100644
--- a/android-mobile/AndroidManifest.xml
+++ b/android-mobile/AndroidManifest.xml
@@ -92,6 +92,7 @@
         android:normalScreens="true"
         android:smallScreens="true" />
 
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
     <!--
          The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
          Remove the comment if you do not require these default permissions.
diff --git a/android-mobile/src/org/subsurfacedivelog/mobile/AndroidSerial.java b/android-mobile/src/org/subsurfacedivelog/mobile/AndroidSerial.java
index fa26f065e..c31e79786 100644
--- a/android-mobile/src/org/subsurfacedivelog/mobile/AndroidSerial.java
+++ b/android-mobile/src/org/subsurfacedivelog/mobile/AndroidSerial.java
@@ -5,6 +5,8 @@ import com.hoho.android.usbserial.driver.*;
 import android.hardware.usb.UsbDeviceConnection;
 import android.hardware.usb.UsbManager;
 import android.hardware.usb.UsbDevice;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
 
 import android.content.Context;
 import android.util.Log;
@@ -69,6 +71,7 @@ public class AndroidSerial {
 	private UsbSerialPort usbSerialPort;
 	private int timeout = 0;
 	private LinkedList<Byte> readBuffer = new LinkedList<Byte>();
+	private WakeLock wakeLock = null;
 
 	private static String printQueue(LinkedList<Byte> readBuffer)
 	{
@@ -83,6 +86,10 @@ public class AndroidSerial {
 	private AndroidSerial(UsbSerialPort usbSerialPort)
 	{
 		this.usbSerialPort = usbSerialPort;
+
+		PowerManager powerManager = (PowerManager) SubsurfaceMobileActivity.getAppContext().getSystemService(Context.POWER_SERVICE);
+		wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Subsurface::AndroidSerialWakelock");
+		wakeLock.acquire();
 	}
 
 	public static AndroidSerial open_android_serial(UsbDevice usbDevice, String driverClassName)
@@ -320,6 +327,8 @@ public class AndroidSerial {
 		Log.d(TAG, "in " + Thread.currentThread().getStackTrace()[2].getMethodName());
 		try {
 			usbSerialPort.close();
+			if(wakeLock != null)
+				wakeLock.release();
 			return AndroidSerial.DC_STATUS_SUCCESS;
 		} catch (Exception e) {
 			Log.e(TAG, "Error in " + Thread.currentThread().getStackTrace()[2].getMethodName(), e);
-- 
cgit v1.2.3-70-g09d2